Re: VKTM background process terminating the DB instance.

Hi Nenad,

Thanks for responding.

Below is the VKTM trace. BTW forgot to mention that, we moved a couple of DB instances to another host post which those DB instances are not getting terminated.

VKTM Trace:

kstmmainvktm: succeeded in setting elevated priority Verify: SETUID is set on ORADISM and restart the instance highres_enabled

• 2021-08-11 04:36:49.798 VKTM running at (1)millisec precision with DBRM quantum (100)ms [Start] HighResTick = 46212770348 kstmrmtickcnt = 0 : ksudbrmseccnt[0] = 1628656609 c536nsf {/n02/oraadmin1/diag/rdbms/cda0462b/cda0462b1/trace}: logout Connection to c536nsf closed. ns9010 {/home/oracle}: logout ns9010 {/home/m6029481}: logout Thanks, Goti

> Strace shows the segmentation fault (sigsegv) which normally translates to
> ora-7445.
>
> What are the last entries in the vktm trace?
>
>
>
> *Von: *oracle-l-bounce_at_freelists.org <oracle-l-bounce_at_freelists.org> im
> namen von: Goti <aryan.goti_at_gmail.com>
> *Datum *Mittwoch, 11. Aug. 2021, 8:54 AM
> *An: *ORACLE-L <oracle-l_at_freelists.org>
> *Betreff: *VKTM background process terminating the DB instance.
>
> Hi All,
>
> Envt Details: DB version 12.1.0.2 Apr 2019 PSU , Running on VM RHEL 7.7
>
> We have an issue wherein we have 6 DB instances running on different VM's
> sharing the same host getting terminated. The background process VKTM dies
> and subsequently PMON terminates the instance. Raised an SR with Oracle a
> couple of weeks back but so far they have not been able to find the root
> cause.Also i did follow some of the recommendations given the below MOS
> notes, but that also didn't help. Prior to VKTM getting terminated , the
> strace just shows "nanosleep({0, 1000000}, 0x7fff29abd7f0) = 0" in its
> trace file. Please find the below gist file which contains strace
> information of VKTM process just before it got terminated.
>
> https://gist.github.com/aryangoti/7fd0882352e4d6e306d212ff1ab0a432
>
> MOS Notes:
> ==============
> Customer RecommendedVKTM processes consume High CPU (Doc ID 1992652.1)
>
> Patch For Excessive VKTM And VKRM Traces In Bug 9382956 Requires Events
> (Doc ID 1381270.1)
>
> Alert log snippet:
> ========================
> Wed Aug 11 01:30:55 2021
> Instance Critical Process (pid: 4, ospid: 8566, VKTM) died unexpectedly
> PMON (ospid: 8561): terminating the instance due to error 56703
> Wed Aug 11 01:30:55 2021
> System state dump requested by (instance=1, osid=8561 (PMON)),
> summary=[abnormal instance termination].
> System State dumped to trace file
> /xxx/xxxxx/diag/rdbms/xxxx/xxxxx/trace/xxxx_diag_8576_20210811013055.trc
> Wed Aug 11 01:30:56 2021
> Dumping diagnostic data in directory=[cdmp_20210811013055], requested by
> (instance=1, osid=8561 (PMON)), summary=[abnormal instance termination].
> Wed Aug 11 01:30:57 2021
> Instance terminated by PMON, pid = 8561
> ==============================================================
>
>
> Appreciate of i can get some help here!
>
>
> Thanks,
> Goti
>
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